CN102809235A - Multistage compression type refrigeration cycle device - Google Patents
Multistage compression type refrigeration cycle device Download PDFInfo
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- CN102809235A CN102809235A CN2012101627533A CN201210162753A CN102809235A CN 102809235 A CN102809235 A CN 102809235A CN 2012101627533 A CN2012101627533 A CN 2012101627533A CN 201210162753 A CN201210162753 A CN 201210162753A CN 102809235 A CN102809235 A CN 102809235A
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Abstract
Provided is a multistage compression type refrigeration cycle device. When a control device (50) starts the multistage compressive refrigeration cycle device, a low-pressure side compression mechanism (1) and a high-pressure side compression mechanism (2) starts running at a lower rotation speed relative to a maximum rotation speed for exerting a maximum capacity, and the rotation speed goes up in stages. Therefore, oil can be inhibited from flowing out of a compressor.
Description
Technical field
The present invention relates to a kind of multistage compression type refrigerating circulatory device with compressing mechanism of multistage.
Background technology
As an example of the multistage compression type refrigerating circulatory device of compressing mechanism, known like the described two sections compression-type refrigeration devices of patent documentation 1 (No. 3152454 communique of Japan Patent) with multistage.Two sections compression-type refrigeration devices of patent documentation 1; Constitute kind of refrigeration cycle thereby connect low band side compressor, high band side compressor, oil eliminator, condenser, decompressor and evaporimeter annularly, and then the low band side compressor is connected through the oily pipe arrangement with open and close valve with the high band side compressor.Through this structure, return the high band side compressor from the outflow of high band side compressor and by the oil of oil eliminator separation, make the oil that in the high band side compressor, reaches more than the ormal weight return the low band side compressor from the high band side compressor through oily pipe arrangement.
In the device of above-mentioned patent documentation 1, as above-mentioned, proposed a kind of mechanism that the oil that flows out compressor is returned, but do not considered to suppress the mechanism of the oil that flows out from compressor originally.In addition, when the oil that is separated by oil eliminator and return the high band side compressor returns when needing the time with ormal weight through oily pipe arrangement, under the state of the inner shortage of oil of compressor, turn round repeatedly, thus, the wearing and tearing of the sliding part of compressor cause fault.
In addition, in the device of patent documentation 1, when accumulating in the inner cold-producing medium of compressor many time during starting compressor, from a large amount of discharging refrigerants of compressor and oil, surpass the separating power of oil eliminator, indissociable oil flows out to the refrigerant passage in downstream.Thus, under the state of the inner shortage of oil of compressor, turn round, thereby the wearing and tearing of the sliding part of compressor cause fault.
Summary of the invention
Therefore, the present invention puts in view of the above problems and proposes, and its purpose is to provide a kind of multistage compression type refrigerating circulatory device from the oil outflow of compressor of realizing suppressing.
The multistage compression type refrigerating circulatory device of the 1st example of the present invention has:
The low band side compressing mechanism, it is arranged in the closed container;
The high band side compressing mechanism, it is connected in series to the discharge side of low band side compressing mechanism, and is arranged in the closed container;
Radiator, it is connected with the discharge side of high band side compressing mechanism;
Decompressor, it is connected with the outlet side of radiator, and the cold-producing medium that flows out radiator is reduced pressure;
Evaporimeter, in post-decompression cold-producing medium inflow evaporator of decompressor and evaporation, evaporator arrangement is in low band side compressing mechanism suction side; And
Control device, the rotating speed of its control low band side compressing mechanism and high band side compressing mechanism.
And then control device is when starting during this multistage compression type refrigerating circulatory device, with rotating speed than the maximum (top) speed low speed of performance maximum capacity, and the running of beginning low band side compressing mechanism and high band side compressing mechanism, and rotating speed is interimly rise.
Therefore, when starting multistage compression type refrigerating circulatory device, begin each running of low band side compressing mechanism and high band side compressing mechanism, rotating speed is rise interimly and reaches maximum (top) speed with rotating speed than maximum (top) speed low speed.According to this control; Under the situation that cold-producing medium starts during in the closed container internal stops; Can suppress to follow in the rolling of the oil of the rotation of rotor, and the internal pressure of low band side compressing mechanism side is gently descended, thus the evaporation of the cold-producing medium in can suppressing to stop.Thus, the outflow of oil can be realized suppressing, thereby the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil can be prevented from compressor.
In the 2nd example of the present invention, control device is when starting during this multistage compression type refrigerating circulatory device, the rotating speed of low band side compressing mechanism and high band side compressing mechanism is interimly with different rotating speed respectively independently rises.
In the case, owing to implement the rising of the stage of rotating speed respectively with rotating speed independently at each compressing mechanism, so can at random control the change of the internal pressure of each compressing mechanism.Thus, because the internal pressure of each compressing mechanism is changed with milder rate of change, so the internal pressure of each compressing mechanism is more gently descended and suppress the evaporation of cold-producing medium.
In the 3rd example of the present invention; Control device is when this multistage compression type refrigerating circulatory device of starting; Make the high band side compressing mechanism than the first starting of low band side compressing mechanism; After the starting of high band side compressing mechanism, starting low band side compressing mechanism under the situation that the shutdown termination condition that is judged to be predefined low band side compressing mechanism is set up.
In the case, through making the high band side compressing mechanism than the first starting of low band side compressing mechanism, thus, the internal pressure of low band side compressing mechanism side is descended very soon and the evaporation that makes the cold-producing medium in the stop in advance.Like this, even the evaporation of the cold-producing medium in the stop is shifted to an earlier date, because the shutdown of low band side compressing mechanism, so oil does not flow out to the outside yet.And; Because when being made as predefined shutdown termination condition establishment the opportunity that will start the low band side compressing mechanism; Therefore be made as the shutdown termination condition as long as can be judged as the condition that the evaporation of this cold-producing medium not have a problem of oil outflow; Just can reduce the downtime of low band side compressing mechanism, and the pressure of fast as far as possible compressing mechanism is risen (げ on the upright Chi) possibility becomes.
In the 4th example of the present invention, control device starts the low band side compressing mechanism under the situation that is judged to be the downtime of having passed through predefined low band side compressing mechanism after the starting of high band side compressing mechanism.
According to the present invention, be made as downtime when termination condition is set up through shutting down through predefined low band side compressing mechanism, thus, adopt based on experiment or empirical law and suitable downtime of decision, thereby can make the starting of low band side compressing mechanism.The control of the inhibition that thus, can provide the pressure of taking into account fast as far as possible compressing mechanism simultaneously to rise to flow out with oil.
In the 5th example of the present invention; Control device is after the starting of high band side compressing mechanism; Even under the situation of the downtime of not passing through predefined low band side compressing mechanism; When the pressure in being judged to be the closed container that is provided with the low band side compressing mechanism is lower than predefined force value, also start the low band side compressing mechanism.
According to the present invention; With shutting down the internal pressure during that is made as low band side compressing mechanism side when termination condition is set up less than predefined force value; Thus; According to experiment or empirical law, employing can be judged as the stress level that degree reaches the level of the problem that does not have the oil outflow that carries out of cold-producing medium evaporation, thereby can start the low band side compressing mechanism.Therefore, the process that need not wait for this downtime just can suitably make low band side compressing mechanism starting, the control of the inhibition that can provide the pressure of taking into account fast as far as possible compressing mechanism simultaneously to rise to flow out with oil.
In the 6th example of the present invention, the multistage compression type refrigerating circulatory device can also have: the middle pressure used decompressor, and it makes the cold-producing medium shunting of flowing out from radiator, and a side's that will shunt cold-producing medium is decompressed to middle the pressure; And inner heat exchanger, it makes through the centre pressure and carries out heat exchange with the cold-producing medium that decompressor is depressurized to the opposing party of middle cold-producing medium of pressing and shunting.At this moment, in inner heat exchanger, the cold-producing medium of pressing in the middle of being decompressed to carried out heat exchange after, make it suck the suction side of high band side compressing mechanism.
According to the present invention; Make through the centre press be decompressed to decompressor in the middle of the cold-producing medium of cold-producing medium of pressing and the high pressure that flows out from radiator inner heat exchanger, carry out heat exchange; Thus; Through carrying out supercooling, can improve refrigerating capacity from the cold-producing medium heat absorption of high pressure and to the cold-producing medium that flows out from radiator.
The multistage compression type refrigerating circulatory device of the 7th example of the present invention also can have oil eliminator, and this oil eliminator separates oil from the cold-producing medium of being discharged by the high band side compressing mechanism, and makes it return the suction side of high band side compressing mechanism.
In the case; Owing to can make in the container of compressing mechanism through oil eliminator and get back to the high band side compressing mechanism to the oil of outside outflow; So the control that can increase the rotating speed of the stage of the low band side compressing mechanism of foregoing invention and high band side compressing mechanism replenishes, thereby can prevent the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil.
The multistage compression type refrigerating circulatory device of the 8th example of the present invention can have oil equalizing circuit; This oil equalizing circuit is communicated with the inside that is provided with the closed container of high band side compressing mechanism the inside of the closed container that is provided with the low band side compressing mechanism, and will be fed to low band side compressing mechanism side at the oil that high band side compressing mechanism side is overflowed (overflow).
In the case; Because also can be to low band side compressing mechanism side supply oil; Feasible oil too is not partial to high band side compressing mechanism side; So can replenish the control that the rotating speed of stage of low band side compressing mechanism and the high band side compressing mechanism of foregoing invention increases, thereby can prevent the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil.
The multistage compression type refrigerating circulatory device of the 9th example of the present invention has:
The low band side compressing mechanism, it is arranged in the closed container;
The high band side compressing mechanism, the discharge side of itself and low band side compressing mechanism is connected in series, and is arranged in the closed container;
Radiator, it is connected with the discharge side of high band side compressing mechanism;
Decompressor, it is connected with the outlet side of radiator, and the cold-producing medium that flows out radiator (3) is reduced pressure;
Evaporimeter, in post-decompression cold-producing medium inflow evaporator of decompressor and evaporation, said evaporator arrangement is in low band side compressing mechanism suction side; And
Control device, the rotating speed of its control low band side compressing mechanism and high band side compressing mechanism.
Control device is controlled; Make when this multistage compression type refrigerating circulatory device of starting; Begin the running of low band side compressing mechanism and high band side compressing mechanism from the first speedup operation range that makes the mild speedup of rotating speed; Then, reach the maximum (top) speed of performance maximum capacity through the rotating speed increment rate second speedup operation range bigger than the rotating speed increment rate of this first speedup operation range.
According to the present invention; When starting multistage compression type refrigerating circulatory device; Begin to carry out each running of low band side compressing mechanism and high band side compressing mechanism from the first speedup operation range of mild speedup; Then, reach maximum (top) speed through increasing the second high speedup operation range of speedup rate of this first speedup operation range of speed ratio.According to this control; Under the situation of when cold-producing medium rests on closed container inside, starting; Can suppress to follow in the rolling of the oil of the rotation of rotor, and the internal pressure of low band side compressing mechanism side is gently descended, thus the evaporation of the cold-producing medium in can suppressing to stop.Therefore, the outflow of oil can be realized suppressing, thereby the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil can be prevented from compressor.
Description of drawings
Fig. 1 is the sketch map of the formation of the expression multistage compression type refrigerating circulatory device of using first embodiment of the present invention;
Fig. 2 is the sketch map of an example that constitutes substantially of the compressor that has of expression multistage compression type refrigerating circulatory device;
Fig. 3 (a) and (b) are figure of the control method when being used to explain the starting multistage compression type refrigerating circulatory device of first embodiment;
Fig. 4 is other the figure of control method when being used to explain the starting multistage compression type refrigerating circulatory device of first embodiment;
Fig. 5 (a) and (b) are figure of the control method when being used to explain the starting multistage compression type refrigerating circulatory device of second embodiment;
Fig. 6 (a) and (b) are figure of the control method when being used to explain the starting multistage compression type refrigerating circulatory device of the 3rd embodiment;
Fig. 7 is the flow chart of the control method when being used to explain the starting multistage compression type refrigerating circulatory device of the 4th embodiment;
Fig. 8 (a) and (b) are figure of the control method when being used to explain the starting multistage compression type refrigerating circulatory device of the 5th embodiment;
Fig. 9 is the sketch map of formation of the multistage compression type refrigerating circulatory device of expression the 6th embodiment;
Figure 10 is the sketch map of formation of the multistage compression type refrigerating circulatory device of expression the 7th embodiment;
Figure 11 is the sketch map of formation of the multistage compression type refrigerating circulatory device of expression the 8th embodiment;
Figure 12 is the sketch map of formation of the multistage compression type refrigerating circulatory device of expression the 9th embodiment;
Figure 13 is the sketch map of formation of the multistage compression type refrigerating circulatory device of other modes of expression;
Figure 14 is the sketch map of formation of the multistage compression type refrigerating circulatory device of other modes of expression.
The specific embodiment
Below, be used for a plurality of modes of embodiment of the present invention with reference to description of drawings.Sometimes in modes, for mode formerly in the corresponding part of item explained, mark identical reference marks, and omit the explanation of repetition.In modes, under the situation of the part of only explanation formation, can be suitable for other modes of explanation in advance about other parts that constitute.In each embodiment, not only specifically show the part combination each other that to make up clearly, as long as combination is not produced obstacle, even do not show also partly combination with one another embodiment clearly.
(first embodiment)
The following explanation with reference to Fig. 1～Fig. 4 is suitable for first embodiment of the present invention.Fig. 1 is the sketch map of formation of the multistage compression type refrigerating circulatory device of expression first embodiment.
The multistage compression type refrigerating circulatory device 100 of first embodiment is that refrigerant pressure is carried out two sections two sections boost type refrigerating circulatory devices that boost, and is suitable to the refrigeration machine use, for example, can be used for refrigerator for container.Multistage compression type refrigerating circulatory device 100 that kind as shown in Figure 1; Have low band side compressor 1 and be used as compressor with high band side compressor 2, with radiator 3, inner heat exchanger 5, first expansion valve 6 (decompressor) and evaporimeter 8 annularly pipe arrangement connect and constitute.And then; Multistage compression type refrigerating circulatory device 100 has second expansion valve 7 (middle press use decompressor) on backward path 10, the pipe arrangement that these backward path 10 bindings are connected the discharge side of the suction side of high band side compressor 2 and low band side compressor 1 and the outlet side pipe arrangement of radiator 3.Cold-producing medium for example is to be the thermal medium of main component with the carbon dioxide, and in the case, multistage compression type refrigerating circulatory device 100 constitutes the supercritical refrigeration cycle that on high-tension side refrigerant pressure reaches the above steam compression type of the critical pressure of cold-producing medium.
Low band side compressor 1 is the low band side compressing mechanism that its discharge portion is connected with the suction portion pipe arrangement of high band side compressor 2, and it sucks low pressure refrigerant, and is compressed to intermediate pressure and discharges to high band side compressor 2.High band side compressor 2 is the high band side compressing mechanisms that link with the discharge side of low band side compressor 1, and it sucks the cold-producing medium of the intermediate pressure of discharging from low band side compressor 1, and is compressed into high-pressure refrigerant and discharges to radiator 3.
Low band side compressor 1 and high band side compressor 2 constitute respectively through control device 50 can freely control rotating speed.Each compressor is controlled rotating speed through control device 50, thereby can adjust the cold-producing medium discharge rate.Low band side compressor 1 is applied in the alternating voltage of having been adjusted frequency by converter 40, controls the rotary speed of its motor part 1b.High band side compressor 2 is applied in the alternating voltage of having been adjusted frequency by converter 41, controls the rotary speed of its motor part 2b.In the case, converter 40,41 receives the supply of dc source or AC power from battery or power supply, and by control device 50 controls.
Fig. 2 is the sketch map of an example that constitutes substantially of expression low band side compressor 1, high band side compressor 2.For example, that kind as shown in Figure 2, low band side compressor 1 and high band side compressor 2 are the rotary compressors with same configuration.Low band side compressor 1 mainly is made up of closed container 1a, motor part 1b and the compression mechanical part 1c that is disposed at the inside of closed container 1a of inner-rotor-type that be disposed at the inside of closed container 1a.High band side compressor 2 mainly is made up of closed container 2a, motor part 2b and the compression mechanical part 2c that is disposed at the inside of closed container 2a of inner-rotor-type that be disposed at the inside of closed container 2a. Motor part 1b, 2b the inside of closed container 1a be positioned at compression mechanical part 1c, 2c above.
Compression mechanical part 1c, 2c are by constituting with lower component: axle 1c1,2c1, and it is that the center can rotate with the central shaft; Roller, it is chimeric on the eccentric shaft of axle 1c1,2c1, follows in the rotation of axle 1c1,2c1 and carry out off-centre in the cylinder interior of working cylinder to rotatablely move; Blade (vane), its front end and roller join and the while moves back and forth in the inside of the blade groove of working cylinder; And axle journal (journal) bearing, the both ends of the surface of its clamping working cylinder and with axle 1c1,2c1 supporting for rotation freely.Compression mechanical part 1c, 2c are fixed in closed container 1a, 2a through the support that around working cylinder, forms.The motor part 1b of inner-rotor-type, 2b are made up of rotor 1b2, the 2b2 of stator 1b1,2b1 and the cylindrical shape of drum; Said stator 1b1,2b1 are soldered to the inside of closed container 1a, 2a, and said rotor 1b2,2b2 are last to axle 1c1,2c1 by hot charging.Stator 1b1,2b1 are made up of electromagnetic steel plate and coil in the central axis direction laminated.
The working fluid that circulates in low band side compressor 1 and high band side compressor 2 is directed to the discharge chambe of compression mechanical part 1c, 2c from suction line 1d, the 2d inlet hole through working cylinder.To the coil electricity of stator 1b1,2b1 and the magnetic field interaction of the permanent magnet of magnetic field that produces and rotor 1b2,2b2 and produce torque; This torque actuated rotor 1b2,2b2 rotation; Make roller carry out off-centre and rotatablely move through axle 1c1,2c1; Thereby the volume-variation of discharge chambe, compression working fluid.When compressed working fluid is opened at the dump valve of tap,, be discharged to the outside of closed container 1a, 2a by discharge pipe 1e, 2e through the inside of closed container 1a, 2a.
In multistage compression type refrigerating circulatory device 100 shown in Figure 1, through evaporimeter 8, and the gas that gasifies by carrying out heat exchange between pressure fan 9 air supplied is inhaled into low band side compressor 1.Be forced into intermediate pressure and the refrigerant gas that is discharged from flows into backward path 10 and be depressurized through second expansion valve 7 and be intermediate pressure through low band side compressor 1; The refrigerant mixed that has been heated with carrying out heat exchange at inner heat exchanger 5 and the remaining cold-producing medium that flows out radiator 3 afterwards is inhaled into high band side compressor 2 afterwards.
Be pressurized to the refrigerant gas inflow radiator 3 of the high pressure of discharge pressure through high band side compressor 2, through with carry out heat exchange by pressure fan 4 air supplied and dispel the heat, cool off.Flow out the cold-producing medium of radiator 3, a part flows into backward path 10, thus 6 shuntings of remaining refrigerant flow direction first expansion valve.Flow into the cold-producing medium of backward path 10, after second expansion valve 7 is depressurized to intermediate pressure, in inner heat exchanger 5 and the remaining cold-producing medium heat exchange of flowing out radiator 3.The remaining cold-producing medium that flows to first expansion valve 6 through inner heat exchanger 5 be decompressed to the cold-producing medium heat exchange of intermediate pressure by second expansion valve 7, thereby be cooled, flow into first expansion valve 6 then.Then, the cold-producing medium that is reduced pressure by first expansion valve 6 evaporates in evaporimeter 8 and from by absorbing heat pressure fan 9 air supplied, is inhaled into low band side compressor 1.
And, thereby pressure fan 4 and pressure fan 9 constitute the air quantity that the rotating speed of controlling fan electromotor 4a, 9a through control device 50 can be adjusted the air that is fed to radiator 3, evaporimeter 8 respectively.
In the multistage compression type refrigerating circulatory device, when refrigerating circulatory device is placed in following time of state of shutdown, because the influence of environment temperature variation etc., becomes cold-producing medium and accumulate, the what is called state of sleeping soundly to compressor inside.Under this state, compressor inside becomes the oil with lubrication and the state of refrigerant mixed.Line shown in dotted lines in Figure 2 is illustrated in the liquid level of compressor mixing material inner, cold-producing medium and oil, and this liquid level is filled to compression mechanical part 1c, the moistening position of 2c.
When the state of sleeping soundly when this cold-producing medium carried out significantly, the inner liquid measure of compressor increases, and is stored in the liquid level of the inner mixing material of compressor, and was such shown in the double dot dash line of Fig. 2, arrives motor part 1b, 2b.When starting multistage compression type refrigerating circulatory device under this state; Through the rotor 1b2 of motor part 1b, 2b, the rotation of 2b2; Oily rolled-up with the cold-producing medium blending; Rolled-up oil flows out to the outside of compressor from discharge pipe 1e, the 2e of top, is present in the refrigerant passage in the circulation.
And then; In the multistage compression type refrigerating circulatory device; Under the situation of starting the low band side compressor with the output of the intermediate pressure that can obtain described regulation (compressor rotary speed of " existing starting method " that the dotted line of Fig. 3 (a) is represented); Low band side compressor pressure inside descends from the state of prestarting, high band side compressor pressure inside and low band side compressor pressure inside balance sharp.Descend through this rapid pressure, be stored in the inner cold-producing medium evaporation of low band side compressor, roll oil contained in the mixed liquor.The cold-producing medium evaporation that compressor is inner, thus, the liquid fluctuating of mixing material, and then evaporate easily, oil becomes mist, easily to the outside outflow of compressor.Therefore, through such low band side compressor pressure inside decline phenomenon, also produce oil to the outside outflow of compressor.And the compressor pressure inside under this situation descends shown in the dotted line of Fig. 3 (b).As above, to the outside outflow of compressor, when under the state of the inner shortage of oil of compressor, turning round, the sliding part wearing and tearing of compressor cause fault through oil.
Therefore, in the multistage compression type refrigerating circulatory device 100 of this embodiment,, the control of characteristics is arranged in order to suppress oil to the outside outflow of compressor.Below, the control method during about starting multistage compression type refrigerating circulatory device 100 describes with reference to Fig. 3.Such shown in dotted line in Fig. 3 (a), the starting method of existing compressor is when the starting of compressor, with output level (the output level the during specified running) entry into service of the required regulation of running refrigerating circulatory device.Therefore, the rotating speed of compressor rises sharp, reaches rotational speed N m when running (specified rotating speed of target) of the output level of this regulation of performance immediately, remains in operation with fixing rotating speed afterwards.In so existing starting method; Such shown in dotted line in Fig. 3 (b); The state of the balance of each compressor pressure inside during from working time t=0 becomes and has rapid inclination (rate of change); Under the situation of low band side compressor 1, descend, under the situation of high band side compressor 2, rise.The decline of the internal pressure through this low band side compressor 1 as above-mentioned, produces the phenomenon of rolling of oil contained in the mixed liquor, and oil flows out to compressor is outside.
Multistage compression type refrigerating circulatory device 100 is when the starting of compressor; The output level (the output level during specified running) that reaches the required regulation of running refrigerating circulatory device before during; Control low band side compressor 1 and high band side compressor 2 reach rotational speed N m later again so that little rotational speed N 1, the N2 of rotational speed N m of the output level of this regulation of ratio performance is interim ground (stepped ground) warp.Promptly; Such shown in solid line in Fig. 3 (a), control through control device 50, make low band side compressor 1 and high band side compressor 2 continue for first stipulated time with first rotational speed N 1; Then speedup reaches final rotational speed N m then to second rotational speed N 2 and lasting second stipulated time.
In the special starting method that the rotating speed based on such stage increases; Such shown in solid line in Fig. 3 (b); Through the rising slowly of compressor rotary speed, the poised state of each compressor pressure inside during from working time t=0 has the inclination milder than the starting method of prior art (rate of change); Under the situation of low band side compressor 1, descend, under the situation of high band side compressor, rise.The decline slowly of the internal pressure through this low band side compressor 1, owing to suppressed evaporation at the inner cold-producing medium of compressor, thus can suppress the phenomenon of rolling of oil contained in the mixed liquor, thus oil can be reduced to the outside outflow of compressor.
In addition, the control method during starting multistage compression type refrigerating circulatory device 100 also can be based on the control of the rotating speed shown in solid line among Fig. 4.According to the control of this rotating speed, play with at the identical action effect of the starting method shown in solid line among Fig. 3.In this starting method, replace ON, OFF through the output that makes compressor, rotation speed change is a pulse type thus.Control device 50 is through making the ON time relative with the OFF time and change or make the tachometer value variation the time under at ON, thereby can adjust ON, the OFF mean speed of switching time.According to the rotation speed change of this pulse type, become the mean speed that is equivalent to first rotational speed N 1, thereby the rotating speed control same with the rotating speed control of stage shown in Figure 3 can be provided.
Below, the action effect that the multistage compression type refrigerating circulatory device 100 of first embodiment brings is described.According to multistage compression type refrigerating circulatory device 100; Control device 50 is controlled; Make when starting multistage compression type refrigerating circulatory device 100; The rotating speed of maximum (top) speed low speed with than the performance maximum capacity begins the running of low band side compressor 1 and high band side compressor 2, and is rotating speed is risen, and reaches maximum (top) speed.
According to this control, when starting multistage compression type refrigerating circulatory device 100, begin each running of low band side compressor 1 and high band side compressor 2, thereby and rotating speed is rise interimly and reaches maximum (top) speed with rotating speed than maximum (top) speed low speed.Thus; Under the situation of when cold-producing medium rests on closed container 1a, 2a inside, starting; Can suppress to follow in the rolling of the oil of the rotation of rotor 1b2,2b2, and the internal pressure of low band side compressor 1 is descended lentamente, thus the evaporation of the cold-producing medium in suppressing to stop.Therefore, can realize suppressing oil and flow out, thereby the sliding part that can prevent the caused compressor of shortage of oil weares and teares from low band side compressor 1.
In addition,, need not be used to make the pump or the decompressor of the outside that the internal pressure of low band side compressor 1 descends, can suppress oil to the outside outflow of compressor according to the starting of this embodiment control.Therefore, constituting caused costs such as can preventing the part increase with respect to existing circulation rises.
(second embodiment)
In second embodiment, in order to suppress oil to the outside outflow of compressor, the special control of the compressor that carries out during about the starting of multistage compression type refrigerating circulatory device 100 explain and the first embodiment Different control.Second embodiment is for the following embodiment that does not specify, for example the action of formation, each one, action effect etc. are identical with first embodiment.
Below, the control method during about the starting multistage compression type refrigerating circulatory device 100 of second embodiment describes with reference to Fig. 5.Multistage compression type refrigerating circulatory device 100 independently carries out rotating speed control respectively for each compressor when low band side compressor 1 and 2 startings of high band side compressor.Promptly; For low band side compressor 1; The output level (the output level during specified running) that reaches the required regulation of running refrigerating circulatory device before during, control and make that being interim ground (stepped ground) reaches rotational speed N m again through littler rotational speed N L1, the NL2 of rotational speed N m than the output level of this regulation of performance.In addition; For high band side compressor 2; During before the output level that reaches the required regulation of running refrigerating circulatory device, control the feasible interim ground (stepped ground) that is and reach rotational speed N m again through littler rotational speed N H1, the NH2 of rotational speed N m than the output level of bringing into play this regulation.
Promptly; Such shown in solid line in Fig. 5 (a); Low band side compressor 1 is by control device 50 controls; Use the stipulated time so that the first rotational speed N L1 continues the predefined first low section, then speedup is to the second rotational speed N L2 and make its continue predefined second low section to use the stipulated time, reach final rotational speed N m then.High band side compressor 2 is by control device 50 controls; So that continuing the predefined first high section, the first rotational speed N H1 uses the stipulated time; Then speedup is to the second rotational speed N H2 and make its continue the predefined second high section to use the stipulated time, reach final rotational speed N m then.Like this, setting NL1 and NH1 for is different rotating speed, and NL2 and NH2 are different rotating speed.In addition, the first low section is used the stipulated time with the stipulated time and the first high section, can be identical, and also can be different time.Equally, the second low section is used the stipulated time with the stipulated time and the second high section, can be identical, and also can be different time.
According to so independent respectively differently special starting method of controlling the rotating speed of low band side compressor 1 and high band side compressor 2; Such shown in solid line in Fig. 5 (b); Owing to can control the pressure oscillation in each compressor arbitrarily, so the poised state of each compressor pressure inside during from working time t=0 further has tilt slowly (rate of change); Thereby pressure is descended, pressure is risen.Because further descending slowly of the internal pressure through this low band side compressor 1 can suppress the evaporation of the inner cold-producing medium of compressor,, realize the reduction of oil to the outside outflow of compressor so suppress the phenomenon of rolling of oil contained in the mixed liquor.
(the 3rd embodiment)
In the 3rd embodiment, in order to suppress oil,, explain and the first embodiment Different control for the special control of the compressor that carries out when the starting of multistage compression type refrigerating circulatory device 100 to the outside outflow of compressor.The 3rd embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with first embodiment.
Below, the control method during for the starting multistage compression type refrigerating circulatory device 100 of the 3rd embodiment describes with reference to Fig. 6.Multistage compression type refrigerating circulatory device 100 is when the starting of low band side compressor 1 and high band side compressor 2; For each compressor; Except " the independently rotating speed control respectively " described in second embodiment; Also carry out following control: when the driving of multistage compression type refrigerating circulatory device 100 begins, only drive high band side compressor 2, low band side compressor 1 is shut down with t2 downtime of regulation, begins in process t2 rear drive.Judging whether passed through t2 downtime of this regulation, is whether the shutdown termination condition of judging low band side compressor 1 is set up.Therefore, through t2 downtime of regulation, mean that the shutdown termination condition of low band side compressor 1 is set up.
Promptly; Such shown in solid line in Fig. 6 (a), low band side compressor 1 is controlled by control device 50, makes to begin t2 downtime through regulation from the driving of multistage compression type refrigerating circulatory device 100; Drive beginning then; And speedup is to the first rotational speed N L1, and when elapsed time t4, speedup is to second rotating speed.High band side compressor 2 is controlled by control device 50; Make the driving that is accompanied by multistage compression type refrigerating circulatory device 100 begin; Rise with the first rotational speed N H1; Make this rotating speed from driving begin to through speedup behind the stipulated time t1 to the second rotational speed N H2, when when driving beginning elapsed time t3, speedup is to final rotational speed N m.At this moment, NL1 and NH1 and NL2 and NH2 can be different rotating speed, also can be identical rotating speeds.
Special starting method according to such rotating speed control based on compressor; Through making high band side compressor 2 before low band side compressor 1, begin to drive; Refrigerant pressure in the low band side compressor 1 is descended, and can before driving low band side compressor 1, make the cold-producing medium rapid evaporation of sleeping soundly in the low band side compressor 1.In this evaporation process, because 1 shutdown of low band side compressor, so can not roll oil.Thus, low band side compressor 1 flow out so suppress the caused oil of cold-producing medium evaporation, thereby realization oil is to the reduction of the outside outflow of compressor owing to just start after the cold-producing medium evaporation of sleeping soundly in compressor.
In addition; The moment through with the establishment of the shutdown termination condition of low band side compressor 1 is made as t2 downtime through predefined low band side compressor 1; Thus, can adopt based on experiment or empirical law and suitable downtime of decision, make 1 starting of low band side compressor.Therefore, a kind of take into account the simultaneously beginning of fast as far as possible compressing mechanism and the control of the inhibition of oil outflow can be provided.
(the 4th embodiment)
In the 4th embodiment, in order to suppress oil to the outside outflow of compressor, and the special control of the compressor that when 100 startings of multistage compression type refrigerating circulatory device, carries out explain and the 3rd embodiment Different control.In control by the explanation of the 4th embodiment; Except the control of the 3rd embodiment; Through downtime of regulation before the t1; Handle under the situation that termination condition sets up in the shutdown of low band side compressor 1, the process of not waiting for t1 downtime is just removed the shutdown of low band side compressor 1 and is handled, and low band side compressor 1 is risen with the first rotational speed N L1.The 4th embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with first embodiment and the 3rd embodiment.
Below, the control method during for the starting multistage compression type refrigerating circulatory device 100 of the 4th embodiment describes with reference to the flow chart of Fig. 7.This control is the starting control that low band side compressor 1 and high band side compressor 2 is urged to final rotating speed, when the starting order of multistage compression type refrigerating circulatory device 100 occurs, begins.At first, in step 10, high band side compressor 2 begun the processing of first low-speed running (rising to the running of the first rotational speed N H1), in step 20, low band side compressor 1 is shut down processing.
Then, in step 30, judge whether the shutdown processing termination condition of low band side compressor 1 is set up.So-called should the shutdown handled the situation that termination condition is set up, and is the situation of low band side compressor 1 pressure inside less than predefined pressure.The pressure of this regulation can be set for according to experimental data and empirical law: the pressure that the evaporation of the cold-producing medium of imagination low band side compressor 1 inside is accomplished less than this pressure the time.That is, so-called pressure less than regulation is meant according to experiment or empirical law, can be judged as the stress level that degree reaches the level that does not have the oily problem that flows out that carries out of cold-producing medium evaporation.
Then, in step 30, when being judged to be the establishment of shutdown processing termination condition, in step 40, low band side compressor 1 is carried out the processing that begins first low-speed running (rising to the running of the first rotational speed N L1).
On the other hand, when in step 30, being judged to be when shut down handling termination condition and still being false, then in step 35, after the starting of multistage compression type refrigerating circulatory device 100, judge t1 downtime that whether has passed through regulation.When in step 35, being judged to be when also not passing through t1, return step 30 once more.When in step 35, being judged to be, in step 40, low band side compressor 1 is carried out the processing that begins first low-speed running (rising to the running of the first rotational speed N L1) through t1.
Like this; About low band side compressor 1; Even regulation downtime t1 through before, in step 30, be judged to be and shut down handle under the situation that termination condition sets up, it is contemplated that to accomplishing in the evaporation of the inner cold-producing medium of the prestart low band side compressor of low band side compressor 11; So through downtime of regulation before the t1, starting low band side compressor 1.According to this control, can suppress oil to the outside outflow of compressor, and can shift to an earlier date the specified running of low band side compressor 1.Therefore, a kind of multistage compression type refrigerating circulatory device 100 can be provided, it prevents damage, the fault of the caused compressor of shortage of oil, and can bring into play desirable ability as early as possible.
When in step 40, under first low-speed running, starting low band side compressor 1, in step 50, after the starting of multistage compression type refrigerating circulatory device 100, judge and whether passed through stipulated time t2.This processing is carried out up to process t2 repeatedly.In step 50, when being judged to be when having passed through t2, advance to step 60, carry out of the processing of high band side compressor 2 speedups to second low-speed running (speedup is to the running of the second rotational speed N H2).
Then, in step 70, after the starting of multistage compression type refrigerating circulatory device 100, judge and whether passed through stipulated time t3.This processing is carried out up to process t3 repeatedly.When in step 70, being judged to be when having passed through t3, advance to step 80, carry out of the processing of low band side compressor 1 speedup to upper limit speed.
And then, in step 90, after the starting of multistage compression type refrigerating circulatory device 100, judge and whether passed through stipulated time t4.This processing is carried out up to process t4 repeatedly.When in step 90, being judged to be when having passed through t4, advance to step 100, carry out of the processing of high band side compressor 2 speedups to upper limit speed, finish this control.
(the 5th embodiment)
In the 5th embodiment, in order to suppress oil to the outside outflow of compressor and the special control of the compressor that carries out during the starting at multistage compression type refrigerating circulatory device 100 explain and the first embodiment Different control.The 5th embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with first embodiment.
Below, the control method during for the starting multistage compression type refrigerating circulatory device 100 of the 5th embodiment describes with reference to Fig. 8.In multistage compression type refrigerating circulatory device 100; Control low band side compressor 1 and high band side compressor 2 through control device 50; Make when the starting of compressor; The output level (the output level during specified running) that reaches the required regulation of running refrigerating circulatory device before during, through the first speedup operation range and the rotating speed increment rate second speedup operation range bigger of slow speedup, reach the rotational speed N m of the output level of bringing into play this regulation than the first speedup operation range.
Specifically; Such shown in solid line in Fig. 8 (a); The first speedup operation range is to need the time t1 and the operation range of speedup very lentamente from rotating speed 0 to rotational speed N 1, and the second speedup operation range is to need time t2 and than the first speedup operation range operation range of speedup quickly from rotational speed N 1 to rotational speed N 2.That is, the first speedup operation range is the rotating speed increment rate of N1/t1, and the second speedup operation range is the rotating speed increment rate of (N2-N1)/(t2-t1).
In little operation range, begin at first at the speedup rate of change of rotating speed like this; Then through excessive operation range; Reach in the special starting method of final rotational speed N m, such shown in solid line in Fig. 8 (b), through the mild rising of compressor rotary speed; The poised state of each compressor pressure inside during from working time t=0; Have the inclination milder (rate of change), in the situation downforce decline of low band side compressor 1, in the situation downforce rising of high band side compressor 2 than the starting method of prior art.Because the mild decline of the internal pressure through this low band side compressor 1 is suppressed at the evaporation of the inner cold-producing medium of compressor, thus the phenomenon of rolling of oil contained in the mixed liquor can be suppressed, and can reduce oil to the outside outflow of compressor.
(the 6th embodiment)
The multistage compression type refrigerating circulatory device 100A of the 6th embodiment with respect to the multistage compression type refrigerating circulatory device 100 of first embodiment, is the mode with oil eliminator 11 and oily backward path 11a.The 6th embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with first embodiment.Fig. 9 is the sketch map that constitutes substantially of the multistage compression type refrigerating circulatory device 100A of expression the 6th embodiment.
That kind as shown in Figure 9, oil eliminator 11 are arranged between the inlet portion of discharge portion and radiator 3 of high band side compressor 2, and oily backward path 11a makes oil in the refrigerant gas that is separated by oil eliminator 11 return the path of the suction portion of high band side compressor 2.The refrigerant gas that in high band side compressor 2, is pressurised into high pressure is after through the oil in oil eliminator 11 divided gas flows, and entering radiator 3 also is cooled.
Returned at the suction side of high band side compressor 2 through oily backward path 11a by the oil of oil eliminator 11 separation; And the cold-producing medium that is afterwards reduced pressure intermediate pressure by second expansion valve 7 and return through backward path 10 that dispels the heat with the cold-producing medium that in low band side compressor 1, is pressurized to intermediate pressure and in radiator 3 mixes mutually, thereby is inhaled into high band side compressor 2.Therefore, according to the refrigerating circulatory device of this embodiment, can guarantee the oil of ormal weight in the inside of high band side compressor 2.Therefore; Owing to can make the oil that flows out to the outside in the container of compressing mechanism return high band side compressor 2 through oil eliminator 11; So the structure that the control that increases through the rotating speed to the stage in described low band side compressor 1 and the high band side compressor 2 replenishes can prevent the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil.
(the 7th embodiment)
The multistage compression type refrigerating circulatory device 100B of the 7th embodiment with respect to the multistage compression type refrigerating circulatory device 100A of the 6th embodiment, is the mode with oil equalizing circuit 12.The 7th embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with the 6th embodiment.Figure 10 is the sketch map that constitutes substantially of the multistage compression type refrigerating circulatory device 100B of expression the 7th embodiment.
That kind shown in figure 10, oil equalizing circuit 12 constitute the access that connects low band side compressor 1 inside and high band side compressor 2 inside.This access and connecting portion high band side compressor 2 are set at the height and position of the liquid level that will adjust in high band side compressor 2 inside.Thus, the oil that overflows in the inside of high band side compressor 2 flows out to the outside of high band side compressor 2 through the access that constitutes oil equalizing circuit 12, is supplied to the inside of low band side compressor 1.Thus, utilization can make the unnecessary oil mass oil return in the high band side compressor 2 arrive the structure of low band side compressor 1, can the oily balance of low band side compressor 1 and high band side compressor 2 be remained under the good state.Therefore; Owing to also supply oil to low band side compressor 1 side; Feasible oil too is not partial to high band side compressor 2 sides; So the structure that the control that utilizes the rotating speed to the stage in described low band side compressor 1 and the high band side compressor 2 to increase replenishes can prevent the sliding part wearing and tearing of the caused compressing mechanism of shortage of oil.
(the 8th embodiment)
The multistage compression type refrigerating circulatory device 100C of the 8th embodiment; A low band side compressor 1 that replaces the multistage compression type refrigerating circulatory device 100 of first embodiment is to have the first low band side compressor 1A that is connected in series and the mode of the second low band side compressor 1B.The 8th embodiment is for the following embodiment that does not specify, for example, the action of formation, each one, action effect etc. are identical with first embodiment.Figure 11 is the sketch map that constitutes substantially of the multistage compression type refrigerating circulatory device 100C of expression the 8th embodiment.
That kind shown in figure 11, the discharge portion of the first low band side compressor 1A is connected with the suction portion pipe arrangement of high band side compressor 2, and the discharge portion of the second low band side compressor 1B is connected with the suction portion pipe arrangement of the first low band side compressor 1A.The second low band side compressor 1B sucks the low pressure refrigerant that flows out evaporimeter 8, and is compressed to first intermediate pressure and is discharged to the first low band side compressor 1A.The first low band side compressor 1A sucks the cold-producing medium of first intermediate pressure of discharging from the second low band side compressor 1B, be compressed to than first intermediate pressure more high pressure second intermediate pressure and be discharged to high band side compressor 2.High band side compressor 2 sucks from the cold-producing medium of second intermediate pressure of first low band side compressor 1A discharge, is compressed into high-pressure refrigerant and is discharged to radiator 3.
The first low band side compressor 1A and the second low band side compressor 1B constitute respectively and can freely control rotating speed by control device 50.Each compressor can be adjusted the cold-producing medium discharge rate thus through control device 50 control rotating speeds.The first low band side compressor 1A is applied the alternating voltage that utilizes converter 40A to adjust frequency and the rotary speed of its motor part is controlled.The second low band side compressor 1B is applied the alternating voltage that utilizes converter 40B to adjust frequency and the rotary speed of its motor part is controlled.In the case, converter 40A, 40B receive the supply of dc source or AC power from battery or power supply, and by control device 50 controls.
(the 9th embodiment)
The multistage compression type refrigerating circulatory device 100D of the 9th embodiment; That kind shown in figure 12 is to possess the mode that circulation that the first low band side compressor 1A that in the multistage compression type refrigerating circulatory device 100C of the 8th embodiment, is connected in series and the second low band side compressor 1B are connected in parallel constitutes.Figure 12 is the sketch map that constitutes substantially of the multistage compression type refrigerating circulatory device 100D of expression the 9th embodiment.The multistage compression type refrigerating circulatory device 100D of the 9th embodiment, for the embodiment beyond above-mentioned, for example, the action of formation, each one, action effect etc. are identical with the 8th embodiment.
(other embodiment)
More than, explained preferred embodiment of the present invention, but the invention is not restricted to above-mentioned embodiment, in the scope that does not break away from purport of the present invention, can carry out various distortion and implement.
In the above-described embodiment, low band side compressor 1 and high band side compressor 2 be as rotary compressor, but be not limited to the compressor of explanation in the above-described embodiment applicable to the compressor of the multistage of the application's invention.That is, go for each compressor of the carried out multistage compression of the application invention, so long as have at the liquid level of the oil of compressor internal storage can be through the rotation of rotor rolled-up and to be discharged to the compressor of outside structure just passable.
In the above-described embodiment; Low band side compressor 1 and high band side compressor 2 are to be applied in by converter etc. to have adjusted the alternating voltage of frequency and the compressor that the rotary speed of its motor part is controlled; But except such compressor; Low band side compressor 1 and high band side compressor 2 also can be the compressors that can carry out intermittent working through making drive source ON, OFF for example in fixing the compressor of output running.
In the above-described embodiment; The fixed choke valve that first expansion valve 6 and second expansion valve 7 are fixed as its aperture; But, thereby also can be used as based on the decompressor that can freely adjust aperture (for example, can become full cut-off) from the control signal of control device 50 from standard-sized sheet.In the case; For example expansion valve has pulse motor and valve body; For example through making the positive and negative rotation of said pulse motor to said pulse motor supply pulse current; Said valve body is driven by said pulse motor, and can control its aperture based on the polarity and the umber of pulse of the pulse current that is supplied to pulse motor.
In addition, circulating in the duty cryogen in the refrigerant passage of multistage compression type refrigerating circulatory device 100, be not limited to carbon dioxide, for example also can be other cold-producing medium such as freon.
The 5th above-mentioned embodiment can make up with second to the 4th above-mentioned embodiment, at least one embodiment of the 6th to the 9th embodiment.
As the formation that can realize the purpose identical, multistage compression type refrigerating circulatory device 100E shown in figure 13 is arranged with the present invention.Multistage compression type refrigerating circulatory device 100E is with respect to multistage compression type refrigerating circulatory device 100; Have the binding path 13a of path of 8 in suction side and the evaporimeter of the inside that connects low band side compressor 1 and low band side compressor 1, and then have decompressor 13 on the 13a on the binding path.In this constitutes, when the starting of multistage compression type refrigerating circulatory device 100E, after driving low band side compressor 1, through the aperture and the constriction path of control decompressor 13, thereby to the inner pressure relief of low band side compressor 1.Thus, promote the evaporation of the storing refrigerant (cold-producing medium of sleeping soundly) of low band side compressor 1 inside.When the evaporation of the cold-producing medium of sleeping soundly is accomplished, just can begin the driving of high band side compressor 2 afterwards.Therefore, at the prestart of high band side compressor 2, can discharge the cold-producing medium of sleeping soundly of low band side compressor 1 inside.
In addition, as the formation that can realize the purpose identical, multistage compression type refrigerating circulatory device 100F shown in figure 14 is arranged with the present invention.Multistage compression type refrigerating circulatory device 100F; With respect to multistage compression type refrigerating circulatory device 100; Have the binding path 14a of path of 8 in suction side and the evaporimeter of the inside that connects low band side compressor 1 and low band side compressor 1, and then on binding path 14a, have pump 14.In this constitutes, when the starting of multistage compression type refrigerating circulatory device 100F,, reduced pressure in the inside of low band side compressor 1 through driving pump 14.Thus, promote the evaporation of the storing refrigerant (cold-producing medium of sleeping soundly) of low band side compressor 1 inside.When the evaporation of the cold-producing medium of sleeping soundly is accomplished, just can begin the driving of low band side compressor 1 and high band side compressor 2 afterwards.
Claims (9)
1. multistage compression type refrigerating circulatory device, it has:
Low band side compressing mechanism (1), it is arranged in the closed container (1a);
High band side compressing mechanism (2), it is connected in series to the discharge side of said low band side compressing mechanism, and is arranged in the closed container (2a);
Radiator (3), its discharge side with said high band side compressing mechanism (2) is connected;
Decompressor (6), its outlet side with said radiator (3) is connected, and the cold-producing medium that flows out said radiator (3) is reduced pressure;
Evaporimeter (8) flows into said evaporimeter (8) and evaporation at the post-decompression cold-producing medium of said decompressor (6), and said evaporimeter (8) is disposed at said low band side compressing mechanism (1) suction side; And
Control device (50), it controls the rotating speed of said low band side compressing mechanism (1) and said high band side compressing mechanism (2),
It is characterized in that,
Said control device (50) is when this multistage compression type refrigerating circulatory device of starting; With rotating speed than the maximum (top) speed low speed of bringing into play maximum capacity; Begin the running of said low band side compressing mechanism (1) and said high band side compressing mechanism (2), and rotating speed is interimly rise.
2. multistage compression type refrigerating circulatory device as claimed in claim 1 is characterized in that,
Said control device (50) is when starting during this multistage compression type refrigerating circulatory device (100), the rotating speed of said low band side compressing mechanism (1) and said high band side compressing mechanism (2) is interimly with different rotating speed respectively independently rises.
3. multistage compression type refrigerating circulatory device as claimed in claim 1 is characterized in that,
Said control device (50) is when this multistage compression type refrigerating circulatory device (100) of starting; Make said high band side compressing mechanism (2) than the first starting of said low band side compressing mechanism (1); After the starting of said high band side compressing mechanism (2), starting said low band side compressing mechanism (1) under the situation that the shutdown termination condition that is judged to be predefined said low band side compressing mechanism (1) is set up.
4. multistage compression type refrigerating circulatory device as claimed in claim 3 is characterized in that,
Said control device (50) starts said low band side compressing mechanism (1) under the situation that is judged to be the downtime of having passed through predefined said low band side compressing mechanism (1) after said high band side compressing mechanism (2) starting.
5. multistage compression type refrigerating circulatory device as claimed in claim 4 is characterized in that,
Said control device (50) is after said high band side compressing mechanism (2) starting; Even under the situation of the downtime of not passing through predefined said low band side compressing mechanism (1); When the pressure in being judged to be the said closed container (1a) that is provided with said low band side compressing mechanism (1) is lower than predefined force value, also start said low band side compressing mechanism (1).
6. like any described multistage compression type refrigerating circulatory device in claim 1 to the claim 5, said multistage compression type refrigerating circulatory device also has:
The middle pressure with decompressor (7), it makes the cold-producing medium shunting of flowing out from said radiator (3), and a side's that will shunt cold-producing medium is decompressed to middle the pressure; And
Inner heat exchanger (5), it makes through pressure in the middle of said and carries out heat exchange with the cold-producing medium that decompressor (7) is depressurized to the opposing party of middle cold-producing medium of pressing and said shunting,
In said inner heat exchanger (5),, make it suck the suction side of said high band side compressing mechanism (2) to after being pressed in the middle of said the cold-producing medium of pressing in the middle of being decompressed to decompressor (7) to carry out heat exchange.
7. like any described multistage compression type refrigerating circulatory device in claim 1 to the claim 5, it is characterized in that,
Said multistage compression type refrigerating circulatory device has oil eliminator (11), and this oil eliminator (11) separates oil from the cold-producing medium of being discharged by said high band side compressing mechanism (2), and makes it return the suction side of said high band side compressing mechanism (2).
8. like any described multistage compression type refrigerating circulatory device in claim 1 to the claim 5, it is characterized in that,
Said multistage compression type refrigerating circulatory device has oil equalizing circuit (12); This oil equalizing circuit (12) is communicated with the inside that is provided with the said closed container (2a) of said high band side compressing mechanism (2) the inside of the said closed container (1a) that is provided with said low band side compressing mechanism (1), and will be fed to said low band side compressing mechanism (1) side at the oil that said high band side compressing mechanism (2) side is overflowed.
9. multistage compression type refrigerating circulatory device, it has:
Low band side compressing mechanism (1), it is arranged in the closed container (1a);
High band side compressing mechanism (2), the discharge side of itself and said low band side compressing mechanism (1) is connected in series, and is arranged in the closed container (2a);
Radiator (3), its discharge side with said high band side compressing mechanism (2) is connected;
Decompressor (6), its outlet side with said radiator (3) is connected, and the cold-producing medium that flows out said radiator (3) is reduced pressure;
Evaporimeter (8) flows into said evaporimeter (8) and evaporation at the post-decompression cold-producing medium of said decompressor (6), and said evaporimeter (8) is disposed at said low band side compressing mechanism (1) suction side; And
Control device (50), it controls the rotating speed of said low band side compressing mechanism (1) and said high band side compressing mechanism (2),
It is characterized in that,
Said control device (50) is controlled; Make when this multistage compression type refrigerating circulatory device of starting; Begin the running of said low band side compressing mechanism (1) and said high band side compressing mechanism (2) from the first speedup operation range that makes the mild speedup of rotating speed; Then, reach the maximum (top) speed of performance maximum capacity through the rotating speed increment rate second speedup operation range bigger than the rotating speed increment rate of this first speedup operation range.
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| Application Number | Priority Date | Filing Date | Title |
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| JP2011120507A JP5510393B2 (en) | 2011-05-30 | 2011-05-30 | Multistage compression refrigeration cycle equipment |
| JP2011-120507 | 2011-05-30 |
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| CN102809235B CN102809235B (en) | 2015-04-08 |
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| CN105228842B (en) * | 2013-03-21 | 2018-06-01 | 开利公司 | Refrigerant vapor compression system and the cold storage container used in transporting perishable items |
| CN107270570A (en) * | 2013-09-30 | 2017-10-20 | 三菱重工业株式会社 | Heat pump and heat-pump-type hot-warer supplying machine |
| CN108027176A (en) * | 2015-09-15 | 2018-05-11 | 株式会社电装 | Multiple compression refrigerating circulatory device |
| CN108027176B (en) * | 2015-09-15 | 2020-01-21 | 株式会社电装 | Multistage compression refrigeration cycle device |
| CN110199161A (en) * | 2017-01-25 | 2019-09-03 | 株式会社电装 | Refrigerating circulatory device |
| CN110582417A (en) * | 2017-05-05 | 2019-12-17 | 威伯科有限公司 | Method for operating a pressure control device with a multistage compressor and pressure control device |
| CN110582417B (en) * | 2017-05-05 | 2022-12-23 | 威伯科有限公司 | Method for operating a pressure control device with a multistage compressor and pressure control device |
| CN110234945A (en) * | 2017-07-17 | 2019-09-13 | 株式会社电装 | Vehicle-mounted refrigerating plant |
| CN110234945B (en) * | 2017-07-17 | 2020-11-27 | 株式会社电装 | Vehicle-mounted refrigerating device |
| CN110887265A (en) * | 2019-11-25 | 2020-03-17 | 珠海格力电器股份有限公司 | Internal circulation superposition heat pump system, control method and heat pump dryer |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012247154A (en) | 2012-12-13 |
| JP5510393B2 (en) | 2014-06-04 |
| CN102809235B (en) | 2015-04-08 |
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